When you've got non-HTML pages on your website, like PDFs or spreadsheets, you gained’t be able to put into action hreflang during the in the HTML because it doesn’t exist.  Al enviar este formulario, acepto que PrestaShop S.A utilice los datos que he facilitado para el envío de boletines y https://addons.prestashop.com/ru/seo-natural-search-engine-optimization/31857--rich-snippets-json-ld-opengraph-seo.html